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Reagents and conditions: (a)76t-BuONa, Pd(OAc)2 (3 mol %), Pd2(dba)3 (3 mol %), PCy3 (7 mol %), t-Bu3P (7 mol %), dry toluene, 90 °C, 10 h; (b)558 Pd(OAc)2 (10 mol %), PPh3 (20 mol %), norbornene (1 equiv), Cs2CO3 (4 equiv), toluene, 95 °C, 6 h; (c)559 PdCl(C3H5)(dppb) (2 mol %), KOAc (2 equiv), DMA, 150 °C, 72 h.
